package com.stone.design.patterns.observer.weatherdata;

/**
 * @author Stone
 * @version V1.0
 * @description:
 * @date 4/18/18 22:29
 * @email redsstone@163.com
 */
public interface Subject {

    void registerObserver(Observer observer);
    void removeObserver(Observer observer);
    void notifyObservers();
}
